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2013-12-05 Shell scripts Supporting tagline

05 December 2013

The following scripts are all of bash scripts, and test passed on ubuntu12.04.

detect net:

#!/bin/sh
# author: lst
# date : 2013-12-05	
num=0

until [ "$num" -gt "1" ]
do
    	num=`ifconfig | grep -i 'inet addr' | wc -l`
	echo 'net detecting...'
	sleep 2
done

sleep 2
`stardict&`
`thunderbird&`
`chromium-broswer&`
echo '\n\nnet connected!'

whileread

#!/bin/sh
# whileread
while read LINE
do
	echo $LINE
done < $1
#!/bin/sh
# menu
# set the date, user and hostname up
MYDATE=`date +%d/%m/%Y`
THIS_HOST=`hostname -s`
USER=`whoami`
# loop forever !
while :
do
	# clear the screen
	tput clear
	# here documents starts here
	cat <<MAYDAY
	User: $USER                      Host: $THIS_HOST                             Date: $MYDATE          
	                         1: List files in current directory
			         2: Use the vi editor
			         3: See who is on the system
			         H: Help screen
			         Q: Exit Menu	 
MAYDAY

	# here document finished
	echo -e -n "\tYour Choice [1,2,3,H,Q] >"
	read CHOICE
	case $CHOICE in
		1) ls
			;;
		2) vi
			;;
		3) who
			;;
		H|h)
			#use a here document for the help screen
			cat <<MAYDAY
			This is the help screen, nothing here yet to help you!
MAYDAY
			;;
		Q|q) exit 0
			;;
		*) echo -e "\t\007unknown user response"
			;;
	esac
	echo -e -n "\tHit the return key to continue"
	read DUMMY
done

heredoc

#!/bin/sh
cat <<MAY
111
222
aaa
bbb
ccc
MAY

tr case2

#!/bin/sh
#tr_case2
# convert case, using getopts
EXT=""
TRCASE=""
FLAG=""
OPT="no"
VERBOSE="off"

while getopts :luv OPTION
do
	case $OPTION in
		l) TRCASE="lower"
			EXT=".LC"
			OPT=yes
			;;
		u) TRCASE="upper"
			EXT=".UC"
			OPT="yes"
			;;
		v) VERBOSE=on
			;;
		\?) echo "Usage: `basename $0`: -[l|u] -v file[s]"
			exit 1
			;;
	esac
done

# next argument down only please
shift `expr $OPTIND - 1`
# are there any arguments passed ???
if [ "$#" = "0" ] || [ "$OPT" = "NO" ]
then
	echo "Usage: `basename $0`: -[l|u] -v file[s]" >&2
	exit 1
fi

for LOOP in "$@"
do
	if [ ! -f $LOOP ]
	then
		echo "`basename $0`: Error cannot find file $LOOP" >&2
		exit 1
	fi
	echo $TRCASE $LOOP

	case $TRCASE in
		lower) if [ "$VERBOSE" = "on" ]; then
			echo "doing.. lower on $LOOP .. newfile called $LOOP$EXT"
		fi
		cat $LOOP | tr "[A-Z]" "[a-z]" >$LOOP$EXT
		;;
	upper) if [ "$VERBOSE" = "on" ]; then
		echo "doing.. upper on $LOOP .. newfile called $LOOP$EXT"
	fi
	cat $LOOP | tr "[a-z]" "[A-Z]" >$LOOP$EXT
	;;
	esac
done

lockit

#!/bin/sh
# lockit
# trap signals 2 3 and 15
trap "nice_try" 2 3 15 20

# get the device we are running on
TTY=`tty`
nice_try()
{
	# nice_try
	echo "Nice try, the terminal stays locked"
}

# save stty settings hide characters typed in for the password
SAVEDSTTY=`stty -g`
stty -echo
echo -n "Enter your password to lock $TTY :"
read PASSWORD
clear

while :
do
	# read from tty only !!,
	read RESPONSE < $TTY
	if [ "$RESPONSE" = "$PASSWORD" ]; then
		# password matches...unlocking
		echo "unlocking..."
		break
	fi
	# show this if the user inputs a  wrong password or hits return
	echo "wrong password and terminal is locked..."
done

# restore stty settings
stty $SAVEDSTTY

pingall

#!/bin/sh
# pingall

# grab /etc/hosts and ping each address
cat /etc/hosts| grep -v '^#' | while read LINE
do
	ADDR=`awk '{print $1}'`
	for MACHINE in $ADDR
	do 
		ping -c3 $MACHINE
	done
done

del lines

#!/bin/sh

# del lines
# script takes filename(s) and deletes all blank lines

TEMP_F=/tmp/del.lines.$$

usage()
{
	# usage
	echo "Usage : `basename $0` file [file...]"
	echo "try `basename $0` -help for more info"
	exit 1

}

if [ $# -eq 0 ];then
	usage
fi

while [ $# -gt 0 ]
do
	case $1 in
		-help) cat << MAYDAY
			Use the script to delete all blank lines from a text file(s)
MAYDAY
                        exit 0
                        ;;

		*) FILE_NAME=$1
			if [ -f $1 ]; then
				sed '/^$/d' $FILE_NAME >$TEMP_F
				mv $TEMP_F $FILE_NAME
				echo "processing $1 done" 
			else
				echo "`basename $0` cannot find this file : $1"
			fi
			shift
			;;
	esac
done

colour scr

#!/bin/sh
# colour_scr
tput init
MYDATE=`date +%D`

colour()
{
	# format is background; foregroundm
	case $1 in
		black_green)
			echo '' 
			;;
		black_yellow)
			echo ''
			;;
		black_white)
			echo ''
			;;
		black_cyan)
			echo ''
			;;
		black_red)
			echo ''
			;;
		red_yellow)
			echo ''
			;;
	esac
}

xy()
# xy
# to call: xy row, column, "text"
# goto xy screen co-ordinates
{
	# _R=row,_C=column
	_R=$1
	_C=$2
	_TEXT=$3
	tput cup $_R $_C
	echo -n $_TEXT

}

center()
{
	# center
	# centers a string of text across screen
	# to call: center "string" row_number
	_STR=$1
	_ROW=$2
	# crude way of getting length of string
	LEN=`echo $_STR | wc -c`

	COLS=`tput cols`
	HOLD_COL=`expr $COLS - $LEN`
	NEW_COL=`expr $HOLD_COL / 2`
	tput cup $_ROW $NEW_COL
	echo -n $_STR
}

tput clear
colour red_yellow
xy 2 3 "USER: $LOGNAME"
colour black_cyan
center "ADD A NEW WARP DRIVE TO A STAR SHIP" 3
echo -e "\f\f"
center "-----------------------------------" 4

colour black_yellow
xy 5 1 "---------------------------------------------------------------------------------"
xy 7 1 "---------------------------------------------------------------------------------"
xy 21 1 "---------------------------------------------------------------------------------"
center "Star Date $MYDATE " 22
xy 23 1 "---------------------------------------------------------------------------------"

colour black_green
xy 6 6 "Initials: "
read INIT
xy 8 14
echo -n "Security Code No:         :"
read CODE
xy 10 14
echo -n "Ship's Serial NO:         :"
read SERIAL
xy 12 14
echo -n "Is it on the Port Side    :"
read PORT

colour red_yellow
center "Save This Record [Y..N] : " 18
read ans

# reset to normal
colour black_white
#!/bin/sh
# menu2
# Main menu script
# ignore ctrl-c and quit interrupts

trap "" 2 3 15 20
MYDATE=`date +%d/%m/%Y`
THIS_HOST=`hostname -s`

USER=`whoami`

# user level file
USER_LEVELS=0011_menu2_priv.user.txt

# hold file
HOLD1=hold1.$$

# colour function
colour()
{
	# format is background; foregroundm
	case $1 in
		black_green)
			echo '' 
			;;
		black_yellow)
			echo ''
			;;
		black_white)
			echo ''
			;;
		black_cyan)
			echo ''
			;;
		black_red)
			echo ''
			;;
		red_yellow)
			echo ''
			;;
	esac
}

# just read a single key please
get_char()
{
	# get_char
	# save current stty settings
	SAVEDSTTY=`stty -g`
	stty cbreak
	dd if=/dev/tty bs=1 count=1 2> /dev/null
	stty -cbreak

	# restore stty
	stty $SAVEDSTTY
}

# turn the cursor on or off
cursor()
{
	# cursor
	# turn cursor on/off
	_OPT=$1
	case $OPT in
		on) echo '[?25h'
			;;
		off) echo '[?25l'
			;;
		*) return 1
			;;
	esac

}

# check what privilege level the user has
restrict()
{
	colour red_yellow
	echo -e -n "\n\n\007Sorry you are not authorised to use this function"
	colour black_green
}

user_level()
{
	# user level
	# read in the priv.user file
	while read LINE
	do
		case $LINE in
			# ignore comments
			\#*);;
		*) echo $LINE >>$HOLD1
			;;
	esac
done < $USER_LEVELS

FOUND=false
while read MENU_USER PRIV
do
	if [ "$MENU_USER" = "$USER" ];
	then
		FOUND=true

		case $PRIV in
			yes|YES)
				return 0
				;;
			no|NO)
				return 1
				;;
		esac
	else
		# no match found read next record
		continue
	fi
done < $HOLD1

if [ "$FOUND" = "false" ]; then
	echo "Sorry $USER you have not been authorised to use this menu"
	exit 1
fi

}

# called when user selects quit
my_exit()
{
	# my_exit
	# called when user selects quit!
	# colour black_white
	cursor on
	rm *.$$
	tput reset

	exit 0

}

tput init
# display their user levels on the screen
if user_level; then
	ACCESS="Access Mode is High"
else
	ACCESS="Access Mode is Normal"
fi

tput init
while :
do
	tput clear
	colour black_green
	cat <<MAYDAY
	$ACCESS
	User: $USER                     Host: $THIS_HOST                           Date: $MYDATE
	                                1 : ADD A RECORD
					2 : VIEW A RECORD
					3 : PAGE ALL RECORDS
					4 : CHANGE A RECORD
					5 : DELETE A RECORD
					P : PRINT ALL RECORDS
					H : Help ScREEN
					Q : Exit Menu
MAYDAY
	colour black_cyan
	echo -e -n "\t Your Choice [1,2,3,4,5,P,H,Q] >"
	#read CHOICE
	CHOICE=`get_char`
	case $CHOICE in
		1) ls
			;;
		2) vi
			;;
		3) who
			;;
		4) if user_level; then
			ls -l | wc
		else
			restrict
		fi
		;;
		5) if user_level; then
			pwd
		else
			restrict
		fi
		;;
		P|p) echo -e "\n\nPrinting records......"
		;;
		H|h) 
			tput clear
			cat <<MAYDAY
			This is the help screen, nothing here yet to help you!
MAYDAY
		;;
		Q|q) my_exit

		;;
		*) echo -e "\t\007Unknown user response"
			;;
	esac
	echo -e -n "\tHit the return key to continue..."
	read DUMMY
done

find string from files content, typical usage : find path -name "*.txt" -print | xargs this_script.sh -s string.

#!/bin/sh
# find string from files' content
# script takes string and filename(s) , if found the string inside some file, then output the line number, string and file name.
# author: lst
# date  : 2013-11-30

usage()
{
	# usage
	echo "Usage : `basename $0` -[h] -[s string] file(s)"
	exit 1

}

while getopts :hs: OPTION 
do
	case $OPTION in
		h) cat << MAYDAY
			Use the script to find those file(s) which content contains the string
			`basename $0` -[h] -[s string] file(s)

MAYDAY
                        exit 0
                        ;;

		s) THE_STRING=$OPTARG
			shift
			shift

			;;
		\?) usage
			exit 1
			;;
	esac
done

while [ $# -gt 0 ]
do
	if [ -f $1 ]; then
		if cat -n $1 | grep $THE_STRING; then
			echo "--->$1"
		fi
	else
		echo "`basename $0` cannot find this file : $1"
	fi
	shift
done
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